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Osteosarcoma is suggested to be caused by genetic and molecular alterations that disrupt osteoblast differentiation. Recent studies have reported that transmembrane protein 119 (TMEM119) contributes to osteoblast differentiation and bone development. However, the level of TMEM119 expression and its roles in osteosarcoma have not yet been elucidated. In the present study, TMEM119 mRNA and protein expression was found to be up-regulated in osteosarcoma compared with normal bone cyst tissues. The level of TMEM119 protein expression was strongly associated with tumor size, clinical stage, distant metastasis and overall survival time. Moreover, gene set enrichment analysis (GSEA) of the Gene Expression Omnibus (GEO) GSE42352 dataset revealed TMEM119 expression in osteosarcoma tissues to be positively correlated with cell cycle, apoptosis, metastasis and TGF-β signaling. We then knocked down TMEM119 expression in U2OS and MG63 cells using small interfering RNA, which revealed that downregulation of TMEM119 could inhibit the proliferation of osteosarcoma cells by inducing cell cycle arrest in G0/G1 phase and apoptosis. We also found that TMEM119 knockdown significantly inhibited cell migration and invasion, and decreased the expression of TGF-β pathway-related factors (BMP2, BMP7 and TGF-β). TGF-β application rescued the inhibitory effects of TMEM119 knockdown on osteosarcoma cell migration and invasion. Further in vitro experiments with a TGF-β inhibitor (SB431542) or BMP inhibitor (dorsomorphin) suggested that TMEM119 significantly promotes cell migration and invasion, partly through TGF-β/BMP signaling. In conclusion, our data support the notion that TMEM119 contributes to the proliferation, migration and invasion of osteosarcoma cells, and functions as an oncogene in osteosarcoma.
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참고문헌 (25)
참고문헌 신청
Bakhshi S / 2010 / Prognostic markers in osteosarcoma / Expert Rev Anticancer Ther 10 : 271 ~ 287
Cheng Z / 2015 / Overexpression of TMEM158 contributes to ovarian carcinogenesis / J Exp Clin Cancer Res 34 : 75 ~
Cuajungco MP / 2012 / Abnormal accumulation of human transmembrane(TMEM)-176A and 176B proteins is associated with cancer pathology / Acta Histochem 114 : 705 ~ 712
Doolan P / 2009 / TMEM25, REPS2 and Meis 1: favourable prognostic and predictive biomarkers for breast cancer / Tumour Biol 30 : 200 ~ 209
Gill J / 2013 / New targets and approaches in osteosarcoma / Pharmacol Ther 137 : 89 ~ 99
Cheng Z / 2015 / Overexpression of TMEM158 contributes to ovarian carcinogenesis / J Exp Clin Cancer Res 34 : 75 ~
Cuajungco MP / 2012 / Abnormal accumulation of human transmembrane(TMEM)-176A and 176B proteins is associated with cancer pathology / Acta Histochem 114 : 705 ~ 712
Doolan P / 2009 / TMEM25, REPS2 and Meis 1: favourable prognostic and predictive biomarkers for breast cancer / Tumour Biol 30 : 200 ~ 209
Gill J / 2013 / New targets and approaches in osteosarcoma / Pharmacol Ther 137 : 89 ~ 99
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